Jet lag is a temporary sleep problem that can affect anyone who quickly travels across several time zones. It occurs because your bodys internal clock is synced to your original time zone and hasnt changed to the time zone of where youve traveled. The more time zones crossed, the more likely you are to experience jet lag. Jet lag can cause daytime fatigue, an unwell feeling, trouble staying alert, and stomach problems. Symptoms of jet lag can vary and may include difficulty falling asleep, drowsiness during the day, headaches, lack of focus or concentration, extreme tiredness, general feeling of being "off" or not like yourself, upset stomach, and mood changes such as irritability. Jet lag symptoms usually occur within a day or